Improved structural ordering in sexithiophene thick films grown on single crystal oxide substrates

Details Improved structural ordering in sexithiophene thick films grown on single crystal oxide substrates Improved structural ordering in sexithiophene thick films grown on single crystal oxide substrates

2008-09-26

arxiv.org/abs/0809.4683v2

Appl Phys A 97 (2009) 387--394

Physics

Condensed Matter

Materials Science

Scientific paper

We report on sexithiophene films, about 150nm thick, grown by thermal evaporation on single crystal oxides and, as comparison, on Si/SiO2. By heating the entire deposition chamber at 100 C we obtain standing-up oriented molecules all over the bulk thickness. Surface morphology shows step-like islands, each step being only one monolayer height. The constant and uniform warming of the molecules obtained by heating the entire deposition chamber allows a stable diffusion-limited growth process. Therefore, the regular growth kinetic is preserved when increasing the thickness of the film. Electrical measurements on differently structured films evidence the impact of the inter island separation region size on the main charge transport parameters.

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